TiiK Cbinoids from De. S. Hock's Expedition to Japan 1014. 1 1;{ 



The L of the distal p-s with some ii'regiilarilies follows the L 

 (if the arms: iic\ortheloss it shows gi-eat variability in s])ooimciis with 

 an arm-length of 7t) - !M) nun. 



A. II. Ci.ARK has distinguished the two s])ecies A. (iiithus and A. 

 acerba by the following charaetci'istics: 



A. antliiis A. ucerhit 



A) Distal pinnules 1) mm. a) distal pinnules i;{ mm. 



I>) The outei- segnient,'> of distal h) the outer segments of dist. p-s 



l.-s: 1. = 2 X hi'. L-^-3 X hr. 



('I The Mr doi'sal s])ines long and c) the Br dorsal spines blunt, short, 



sti-ongly cui-ved not much curved. 



D) K — s with a roun(le(l tubercle d) K — s with a dorso-ventrally 



elongated tubei'cle. 



K| I Br-s without median carina- e) I Br-s with a faint, low median 



tion carination. 



(]*'| Arms more than X. f) Arms X). 



Some examples from the above-described sj)ecimens ma>- be (juotcd 

 and may be denoted as follows: 



.S/». 1 A(a) Be D E F Sp. 14 a b C 1) E f 



Sp. 9 Aa Bb C d E F Sp. 10 Aa b V d E P 



Np. 34 A(a) B c d e (F) f Sp. Si (A)a Bb Cc d e F 



Sp. 12 a (B)b C D E f .s>. 20 a b (M E f 



From the above cited examples it seems e\ident to me that the 

 characteristics of A. anthns and accrha are irregularly mixed in the 

 different speeinnMis. Clark lays s|iecial stress upon the fact that the 

 L of the distal pinnules and |iinnulars and the blunt spines on the 

 distal Br-s are characteristic of acerhn. This combination scarcely 

 ever occurs in the above-described specimens, but often long p-s to- 

 gether with strongly develo])ed Br-spines. 



From w hat is stated above ■ — the examples could be multiplied — 

 it seems to me to be clear that A. aidJuis and acerba ought to be refer- 

 I'cd t(t the same species. 



.1. lepida is a third species of the genus Asleromeira that A. 11. 

 Clark has described. It is a form diffei'ing fi-om the two previously 

 mentioned species (which have a large cylindi'ical Cd witii a conical end) 

 ■by a small and conical Cd. It is further mentioned that the cin-us-sockets 



Novii Acta Hc-g. Soc. Sc. Ups.. Sei-. 4. Vol. 5. N:o ri. Inipr. '■■ 3 lii'2-'. IT) 



